Consolidate machine installation on bootstrap enrollment

[ymichael]

Human comments

What was wrong

Machine installation exposed both a bootstrap enrollment flow and a separate join-code flow with its own Connect credential redemption. The CLI also issued bare join codes even though enrolling a fresh machine required additional identity and server details.

What changed

• Require a private bootstrap bundle for installer enrollment and delegate enrollment to bb machine enroll.
• Remove bb machine join-code and the installer’s --join-code, --machine-code, and --server flags. Document bb machine create --provider manual and running its printed command on the target machine.
• Preserve bb.sdk.hosts.createJoinCode(), its return types, and the HTTP endpoint for existing plugins. Mark the SDK method deprecated with guidance toward bootstrap enrollment.
• Adapt installer tests and verification recipes to bootstrap enrollment. Daemon wire contracts are unchanged.

How you verified

• pnpm exec turbo run test --filter=@bb/server -- test/app/install-machine-script.test.ts — 36 tests passed. The progress test exercises all 60 readiness probes with a 15-second timeout.

• pnpm exec turbo run test --filter=@bb/sdk --filter=@bb/server-contract — 192 tests passed.

• pnpm exec turbo run test --filter=@bb/server -- test/public/public-host-management.test.ts — 12 tests passed.

• pnpm exec turbo run typecheck --filter=@bb/cli --filter=@bb/sdk — passed.

• sh -n apps/server/src/assets/install-machine.sh and git diff --check — passed.

AGENT GENERATED